Question

40 points help

A scientist is observing an invertebrate animal that she collected in shallow salt water. The animal has a hollow central cavity and a gut. Which animal is the scientist most likely observing?
a cnidarian, because it has a gut
a cnidarian, because it was collected in shallow salt water
a sponge, because it has tissue layers
a sponge, because it is an invertebrate

Answer 1

The answer should be a cnidarian, because it has a gut. Sponges do not have guts. They, however, have hollow central cavity, but a cnidarian also has a central cavity (gastrovascular cavity) that is, again, hollow.
Both animals arr invertebrates and live in shallow salt water.